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use std::ops;

use serde::{Deserialize, Serialize};
use serde_bytes::ByteBuf;

use ex3_crypto::sha256;
use ex3_serde::bincode;

use crate::{Nonce, Version, WalletRegisterId};

pub type TransactionHash = [u8; 32];
pub type r#Type = u32;

#[derive(Serialize, Deserialize, Clone, Debug, PartialEq, Eq)]
pub struct Transaction {
    pub r#type: r#Type,
    pub version: Version,
    pub from: WalletRegisterId,
    /// if the transaction type is [Deposit], this field is None
    pub nonce: Option<Nonce>,
    pub payload: ByteBuf,
    pub signature: Option<ByteBuf>,
}

impl Transaction {
    pub fn hash(&self) -> TransactionHash {
        let bytes = bincode::serialize(&self).unwrap();
        sha256!(&bytes)
    }
}

#[derive(Serialize, Deserialize, Clone, Debug, PartialEq, Eq)]
#[serde(transparent)]
pub struct EncodedTransaction(pub ByteBuf);

impl From<Transaction> for EncodedTransaction {
    fn from(tx: Transaction) -> Self {
        let bytes = bincode::serialize(&tx).unwrap();
        EncodedTransaction(ByteBuf::from(bytes))
    }
}

impl From<&Transaction> for EncodedTransaction {
    fn from(tx: &Transaction) -> Self {
        let bytes = bincode::serialize(&tx).unwrap();
        EncodedTransaction(ByteBuf::from(bytes))
    }
}

impl From<EncodedTransaction> for Transaction {
    fn from(tx: EncodedTransaction) -> Self {
        bincode::deserialize(tx.0.as_ref()).unwrap()
    }
}

impl From<&EncodedTransaction> for Transaction {
    fn from(tx: &EncodedTransaction) -> Self {
        bincode::deserialize(tx.0.as_ref()).unwrap()
    }
}

impl ops::Deref for EncodedTransaction {
    type Target = ByteBuf;

    fn deref(&self) -> &Self::Target {
        &self.0
    }
}

/// Transaction type
/// | type                 | code              | remark                               |
/// | -------------------- | ----------------- | ------------------------------------ |
/// | DEPOSIT              | 1u32              | Deposit transaction.                 |
/// | WITHDRAW             | 2u32              | Withdraw transaction.                |
/// | DESTROY_API_SECRET   | 3u32              | Destroy api secret transaction.      |
/// | DESTROY_MAIN_SECRET  | 4u32              | Destroy main secret transaction.     |
#[allow(dead_code)]
pub mod transaction_type {
    pub const DEPOSIT: u32 = 1u32;
    pub const WITHDRAW: u32 = 2u32;
    pub const DESTROY_API_SECRET: u32 = 3u32;
    pub const DESTROY_MAIN_SECRET: u32 = 4u32;
}